Head to head
Victron 100/30 vs Renogy 40A MPPT Solar Controllers
Both do the same job. The question is which one your boat is actually asking for — and on this site that is a number, not a preference.
| Victron 30 A | Renogy 40 A | |
|---|---|---|
| Charge current | 30 A | 40 A |
| Price band | $220–$320 | $180–$280 |
| Best suited to | Arrays up to about 400 W at 12 V. | Solar-first refits on a budget. |
| Look elsewhere if | Your array is 600 W or more — you would be clipping on the good days. | The install is going to survey and you need marine-grade documentation. |
Victron 30 A
The default 30 A controller on cruising boats, and the reason is the app: you will actually read it.
Renogy 40 A
The value option, and it makes most sense on a boat already running Renogy panels and batteries.
Sized for your boat
32 A
Charge current for a 400 Ah bank with 400 W of solar
Worked from the loads you have set in the calculator. Change the boat and this figure changes with it.
4 options fit — the first is the one we would fit
The honest answer
Size it first, then choose.
A head-to-head between two ratings is the wrong question if neither matches your boat. Work out what the boat needs, then pick between whatever meets it — which is usually a decision about support and documentation rather than about amps.
Before choosing Victron 30 A and Renogy 40 A
Solar array voltage and MPPT controller compatibility
A solar controller must suit the panel arrangement and the battery system. Ask the installer to check maximum input voltage under the expected conditions, current limits and protective devices. Record shading and daily yield before assuming a larger controller will produce more energy. A battery already near full can also limit observed charging output.
Confirm specifications against the exact model and revision offered by the supplier. A listed price band is a planning reference; request a current written quote with installation and commissioning separated from equipment supply.